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Which one of mentioned below is not used as mined rock impurity in the production of phosphoric acid?

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Which one of mentioned below is not used as mined rock impurity in the production of phosphoric acid?

(a) Aluminum

(b) Silicon

(c) Arsenic

(d) Iron-oxides

I had been asked this question in an online quiz.

My question is taken from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

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Correct answer is (c) Arsenic

For explanation I would say: Except arsenic all are such as aluminium, silicon, Iron-oxide are considered as mined rock impurity. The high grade of imported ore is necessary to avoid solubilization of these mined rock impurities.

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